Welch’s or Welchs or Welches??

I looked this up recently, because my sister's married name ends in an "S", and from what I could find, if you're pluralizing the name, you add "es" to the end of the name. So, I think, "Welches" would be correct. I do know for sure that "Welch's" is incorrect, as your FMIL said, the apostrophe + s indicates a possessive, not a plural.

Apostrophes indicate owner ship. Apostrophe before the S shows ownership of a single person or group. Apostrophe after the S is usually plural ownership. In your case, Welch ends in CH, so, it would be Welches. ES is added to names ending with S, X, SH, CH. and Z, while all the rest would simply need the addition of S. Silly English language with silly exceptions. Lol

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You are the Collinses. A house that you own would be the Collins' or Collins's, although I think the extra "s" is unnecessary when the name ends in S already.

View Quoted Comment That's definitely not right! I have a friend who married into a Greek family and sometimes uses a Greek plural ending (just to be silly) which is always fun, but still not right in english.

Hi. If people would like to help me with a very similar thing now instead of waiting till it comes up. I'm going to be a Gomez. Gomezes? Orrr.....

View Quoted Comment My FH's last name/my future last name also ends in -man and this drives me crazy! Whenever we're talking about his family collectively, I say the [lastname]-men. We will definitely not be having any signs or decor that say The [lastname]mans.

OP, you could just say "Welch, Est. 2019"

I would go with Welchs---because it's a name not a noun that ends in S.

It is technically -es

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Nope! No apostrophes, that insinuates that it is possessive. It would just be The Collins because it is both singular and plural.

From: http://grammar.ccc.commnet.edu/grammar/plurals.htm

When a family name (a proper noun) is pluralized, we almost always simply add an "s." So we go to visit the Smiths, the Kennedys, the Grays, etc.When a family name ends in s, x, ch, sh, or z, however, we form the plural by added -es, as in the Marches, the Joneses, the Maddoxes, the Bushes, the Rodriguezes. Do not form a family name plural by using an apostrophe; that device is reserved for creating possessive forms.

When a proper noun ends in an "s" with a hard "z" sound, we don't add any ending to form the plural: "The Chambers are coming to dinner" (not the Chamberses); "The Hodges used to live here" (not the Hodgeses). There are exceptions even to this: we say "The Joneses are coming over," and we'd probably write "The Stevenses are coming, too."

View Quoted Comment I love the solution!! Eliminate the problem! Haha

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THIS IS COMPLETELY CORRECT!

This is why in my house we’ve always done “The Kerins family” or “Kerins Clan” 😂

My ex's family had a sign on their door with that misplaced apostrophe and it drove me NUTS every time I saw it! My brain just latches on and will NOT let me ignore it lol.

Well that's just confusing...I'm going to be a Welch too...Welches feels more correct to me, but I'm currently a Gerlach and we're always the Gerlachs.
Maybe because Gerlach and Gerlachs are still two syllables but Welch is one and Welches looks like the two syllables it is???

This is an idiomatic thing, a consistent variant in grammar. For an estate belonging to a family, you choose the actual family name, no plurals, no possessive forms. As though you are saying The Welch ( family) estate. We say, The Kennedy Estate, or The Kennedy Compound, or The Roosevelt Estate, or The Endicott Estate. The same is true of family crests, or family tartans. The Welch Family Crest, The Welch Estate, The Welch Cottage. The McIntosh plaid.